I'm not very sure but I think they are: Vinegar, lemon juice, black coffee, Orange Juice, battery acid (very acidic), and urine would be an extra.
Obviously its acid, because its name is acid
salt makes it more acidic
They are acidic due to hydrogen ions. The more hydrogen ions converted from the original solution there are the more acidic it will be. For example Hydrochloric Acid converts more hydrogen ions from (hydrogen + water + chloride) solution than citric acid does from its respective solution...
"Why won't anyone answer?" Probably because it's not clear what the question is supposed to mean. The general term for liquids/solutions that are neither acidic nor basic is "neutral", but that's so blindingly obvious that it seems unlikely to have been what you were looking for. Many liquids are neither acidic nor basic: alkanes (well, those that are liquid instead of solid or gaseous), for example. Pure water is another. Most alcohols (phenol being a significant exception ... it's not strongly acidic, but it's acidic enough that an alternative name for it is "carbolic acid").
Hydrofluoric acid.
aspirin is an acid... aspirins chemical name is acetylsalicylic acid
Obviously its acid, because its name is acid
acidic, alkaline higher than 7
Amino acids are, as the name suggests, both amines (basic) and acids (acidic, of course). They fall into the category of compounds known as zwitterions: chemicals that have an acidic part and a basic part in the same molecule.
salt makes it more acidic
Hydrogen can be found in water and air.
Chemicals, protein, ions and water
In a basic sense yes. A man forget his name tried and experiment in a petri dish when he had a few substances in it namely carbon dioxide methane gas water nitrogen gas and possibly one other no oxygen though. Oxygen is acidic. He continuously ran electricity through it and he managed to create life
Body fluids, cellular secretions, and intracellular matrix
They are acidic due to hydrogen ions. The more hydrogen ions converted from the original solution there are the more acidic it will be. For example Hydrochloric Acid converts more hydrogen ions from (hydrogen + water + chloride) solution than citric acid does from its respective solution...
Water is usually neutral. In the event that the water is acidic, it can be neutralized by adding a base. Calcium Hydroxide is an example of a basic substance.
Acidic